Vitamin C Serum is a familiar skin care product with its excellent darkening and brightening effects. But surely you have encountered a situation where Vitamin C serum is oxidized or discolored after a period of use? The cause of this problem may be that you have not stored the Vitamin C serum properly. In today’s article, let’s find out the 6 best ways to store Vitamin C serum guided by experts.
1. Why should Vitamin C serum be preserved?
Before instructing to store Vitamin C serum specifically, you need to have a clear understanding of antioxidant properties and appropriate storage to ensure the effectiveness of Vitamin C ingredients in particular and concentrated Vitamin C serum products. height.
As a great skin care product, however, Vitamin C or Ascorbic acid is an extremely sensitive ingredient to the air and easily oxidizes causing the Vitamin C serum to discolor. Proper storage will help prolong the life and quality of the product.
If the vitamin C serum is oxidized, you should not continue to use it anymore because it can cause harm and irritation to the skin. The simplest way to identify an oxidized vitamin C serum is by color. Depending on the formula of each Vitamin C serum product, the signs of oxidation are different. And of course, the oxidation threshold for each product is different.
- Serum has a dark yellow color: the product has started to oxidize, you need to be careful if your skin is extremely sensitive.
- The serum turns dark brown like cockroach wings: the product is completely oxidized. Discontinue use immediately to avoid irritation.

2. Experts guide 6 ways to preserve Vitamin C serum
Vitamin C plays an essential role in promoting cell regeneration, collagen production, preventing signs of aging, fading dark spots for smooth, youthful skin. However, the structure of Vitamin C is easily destroyed when exposed to air, heat and sunlight, causing Vitamin C serum to oxidize and sometimes cause unwanted irritation on the skin. Here are 6 tips for storing Vitamin C serums suggested by Paula’s Choice expert.
2.1. Close the cap of Vitamin C serum tightly after use
As mentioned above, Vitamin C or Ascorbic Acid is an extremely sensitive ingredient to air. When in direct contact with oxygen, Vitamin C is very easy to break down into Dehydroascorbic Acid (DHAA), which causes the skin to become itchy and irritated. Therefore, tightly closing the cap of the serum bottle after each use and minimizing the time it takes to open the cap is the first and most important way to preserve the Vitamin C serum you need to do to contribute to prolonging the “life span”. ” for product.

2.2. Store Vitamin C serum in a cool place, away from direct sunlight
Experts at Paula’s Choice recommend keeping Vitamin C serum in a cool place and out of direct sunlight as the best way to preserve it. Vitamin C will be less effective and cannot be effective when it is broken down into inactive forms by high temperature. Therefore, when using essence products containing Vitamin C , you need to store them in a cool place to limit oxidation because Vitamin C is an extremely sensitive ingredient to light.
2.3. Store Vitamin C Serum in the Refrigerator
We get the question “should I keep the vitamin C serum in the fridge?” from many customers. Refrigeration will help slow down oxidation compared to storing at room temperature. However, for Paula’s Choice Vitamin C serum, we have researched and created an improved formula containing Vitamin C including benign preservatives, absolutely safe for the skin. At the same time, our Vitamin C serum products have opaque packaging that minimizes the variation of the formula caused by light and air. Accordingly, Vitamin C serum from Paula’s Choice can be left at room temperature and only needs to be stored in the refrigerator if the ambient temperature is too high.
If you do not have a refrigerator dedicated to storing cosmetics, you can keep the serum in a normal refrigerator, but with a location far from food to ensure it does not affect the quality of the serum.
2.4. Avoid leaving Vitamin C serum products in the bathroom
Many beauty followers often leave skin care products including Vitamin C serum in the bathroom. If you are too, or stop doing this immediately. The temperature and humidity in the bathroom inadvertently create favorable conditions for moisture and bacteria to penetrate after each product is opened and closed, reducing the effectiveness of Vitamin C. This is a way to preserve Vitamin C serum that any Every beauty fanatic should take note
2.5. Prioritize dark colored Vitamin C products
The color of the bottle is also a decisive factor in the quality of the serum . The shell is not transparent or dark color will limit the absorption of heat and light shining directly on the bottle. So choose Vitamin C serum products that come in dark glass or plastic bottles.

Normally, the shelf life of vitamin C serums is only about 3 months . Please store the product well so that it can be used for a longer time.
2.6. Use a small volume of Vitamin C serum
Normally, the best shelf life of Vitamin C serum is only about 3 months after opening. Therefore, to be optimal, when choosing to buy a Vitamin C serum, you should prioritize products with a small capacity. For products with a larger capacity, make sure that you store them properly according to the above tips suggested to you by the experts.
Above are 6 ways to preserve Vitamin C serum you should know that experts recommend. Please contact Paula’s Choice Cosmetics through the official Facebook fanpage, Website or Hotline 0973 78 2001 for the fastest advice.